Concrete-mixer.



T. L. SMITH.

CONCRETE MIXER. APPLICATION FILED SEPT.19,1907.

Patented Aug. 5, 1913.

2 SHEETS-SHEET 1.

T. L. SMITH.

CONCRETE MIXER.

APPLICATION FILED SEPT. 19, 1907.

1,069,491 Patented Aug. 5, 1913.

2 S .HEETSSHEET 2.

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THOMAS L. SMITH, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO THE '1. L. SMITHCOMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

CONCRETE-MIXER.

Specification of Letters Patent.

Patented Aug. 55,1913.

Application filed September 19, 1907. Serial No. 383,602.

To all whom it may concern Be it known that I, THOMAS L. SMITH, residingin Milwaukee, in the county of Milwaukee and State of Wisconsin, haveinvented new and useful Improvements inConr ;vide a concrete mixer ofsuch a construction that the material will be thrown from one end of thedrum to the other thereof during its rotation to effect a thoroughmixture, said drum being preferably of a cylindrical shape with its axisat an angle to the axis of rotation and provided with conical end hoodswhich are of a truncated oblique cone shape with their openings at theaxis of rotation of the drum.

With the above and other objects in view, the invention consists-in theconcrete mixer herein claimed, its parts and combinations of parts andall equivalents.

Referring to the accompanying drawings in which like characters ofreference indicate the same parts in the different views; Figure 1 is acentral longitudinal sectional view of a mixing machine constructed inaccordance with this invention, one position of the mixing drum beingshown in full lines and its position after receiving a half turn beingshown in dotted lines; and, Fig. 2 is an end elevation thereof withparts sectioned for clearness of illustration.

In these drawings the base and driving mechanism, except the gear andtrack ring, are of the same construction as now used with a well knowntype of concrete mixer somewhat similar to the construction shown inLetters Patent issued to me on January 7, 1902, No. 690,783, and thegear and track ring only differs from the former construction in theshape given to its bore which is necessary to conform to the shape ofthe mixing drum here employed.

The mixing drum comprises a central section 5 which is cylindrical ornearly so and is mounted to rotate on a horizontal axis while its axisis at a decided angle to the axis of rotation, the ends of the centralcylindrical section lying in vertical planes at right angles to the axisof rotation and having secured thereto end hoods 6 which are of theshape of a truncated oblique cone, with their open smaller ends invertical planes and centered upon the axis of rotation of the drum.

A gear and track ring 7 is mounted on the central sectiou5, beingsupported by rollers 8 journaled on a swinging frame 9 which issuspended from trunnion bearings 10 on a portable stationary frame 11.GuiderolL ers 12 are mounted on the upper part of the swinging frame tobear on opposite sides of the track ring and hold it in position andsimilar guide rollers 13 are likewise journaled in the lower part of theswinging frame for the same purpose.

A pinion 14 is carried by a shaft 15 which is journaled in the swingingframe and meshes with the gear teeth on the periphery of the gear andtrack ring 7 for turning the drum, said shaft having a beveled gear 16meshing with a beveled gear 17 on a drive shaft 18 which is journaledthrough one of the trunnions of j the swinging frame and carries a beltpulley 19 on its outer end.

The cylindrical central portion 5 of the drum is provided with the usualmixing blades 20 and theconical end hoods 6 have similar blades 21 tolift and drop the material and cause it to become thoroughly mixed.

A handle 22 is formed on one of the trunnions of the swinging frame bymeans of which the entire swinging frame andmix- 111g drum may be swungupon the trunnions so as to bring the mixing drum to an inclinedposition for discharging the contents through the discharge opening atthe left of Fig. 1. In the opening at the other end of the drum is acharging hopper 23 which is supported by a link 24 connected with thestationary frame and by rods 25 mounted on the swinging frame, so as tobe movable with the drum.

In operation the drum is caused to rotate on a horizontal axis passingthrough the centers of the openings in its ends, by means of the drivingmechanism as usual, and in rotating the drum will change from theposition shown in full lines in Fig. 1 to the position shown in -dottedlines, so that besides the material being lifted and dumped by themixing blades it is shifted from one end of the drum tothe other andthus becomes thoroughly mixed. When the mixing operation is completedthe drum is tilted as usual so as to discharge the mixture through thedischarge opening, the drum being turned meanwhile if desired tothoroughly rid it of the contents. 9

Obviously the drum need not be truly cylindrical in form as the mixingefl ect is the Same when it is elliptical in cross section, and.consequently the term approximately cylindrical as here employed isintended to comprehend such modifications.

What I claim as my invention is:

l. A mixing machine comprising a drum formed of an approximatelycylindrical body or shell portion terminating in vertical planes atright angles to the axis of rotation, with end hoods of the shape oftruncated oblique cones with their open ends cen tered on the axis ofrotation of the drum and their bases connected with the edges of thebody portion; means for rot'atably supporting the drum with its bodyportion oblique to its axis of rotation, and means for tilting I thedrum.

2. A mixing machine comprising a drum formed of an approximatelycylindrical body or shell portion with end hoods of the shape'oftruncated oblique cones with their open ends. centered on the axis ofrot-atlon of the drum and their bases connected withv with a portion ofthe body portion, whereby the drum in its respective inclined positionspresents an uninterrupted chute-like surface formed by the bottom of thebody portion and the end hood with which it is in alinement and presentsa pocket at the lower end of the chute formed by the bottom of the bodyportion and the other end hood.

In testimony whereof, I affix my signature, in presence of twowitnesses.

THOMAS L. SMITH. v

Witnesses:

A. L. MORSELL, ANNA F. SOHMIDTBAUER.

